I could be off the mark here but the point your emailer may have been trying to make, and how it differs from Tvad's assessment, is whether the performance is amplified or not. If it is not then Tvad is right on that it is not stereo or mono it's real. If however the performance is amplified and played through speakers around the stage or on either side, I think that "reproduction" is normally done in mono so people sitting outside of exact center will hear the entire performance too. Maybe someone will chime in and correct me, but this is what I have surmised from personal experiences. I don't know why a mono recording would conceivably sound better but I'm sure someone else will chime in on that concept.